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Old 01-22-2013, 05:13 PM   #36
julian
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Join Date: Dec 2006
Location: Bedford,Massachusetts,US
Posts: 2,311
Default It is incorrect

Quote:
Originally Posted by toly View Post
The speed maybe doesn't go down but acceleration usually does, see http://tt.tennis-warehouse.com/showt...28#post6835828
It is incorrect
1.The head racket speed decreases AFTER the contact
(when speed means the length of a three dimensional vector)
2.The acceleration is changing the sign at the contact
i.e it is POSITIVE before the contact and NEGATIVE after the contact
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